Wearable heart rate monitor

摘要

Some embodiments provide a wearable fitness monitoring device including a motion sensor and a photoplethysmographic (PPG) sensor. The PPG sensor includes (i) a periodic light source, (ii) a photo detector, and (iii) circuitry determining a user's heart rate from an output of the photo detector. Some embodiments provide methods for operating a heart rate monitor of a wearable fitness monitoring device to measure one or more characteristics of a heartbeat waveform. Some embodiments provide methods for operating the wearable fitness monitoring device in a low power state when the device determines that the device is not worn by a user. Some embodiments provide methods for operating the wearable fitness monitoring device in a normal power state when the device determines that the device is worn by a user.

主权项

1. A method of operating a heart rate monitor of a wearable fitness monitoring device comprising a plurality of sensors including the heart rate monitor and a motion detecting sensor, the method comprising:
(a) operating the heart rate monitor in a first mode while also operating in a second mode configured to detect near proximity of the wearable fitness monitoring device to a user's skin, wherein the first mode is configured to determine one or more characteristics of a user's heartbeat waveform when the wearable fitness monitoring device is in near proximity to the user; (b) from information collected in the second mode, determining that the heart rate monitor is not proximate to the user's skin; (c) determining from information output by the motion detecting sensor that the wearable fitness monitoring device has had been still for at least a defined period; and (d) in response to determining that the heart rate monitor is not proximate to the user's skin and that the wearable fitness monitoring device has been still for at least the defined period, ending operating the heart rate monitor in the first mode.